A flasher is a flashing device used to indicate changes in the direction of a car's travel. The flasher is designed with a new type of circuit, consisting of a low voltage switch circuit, a high voltage switch circuit, a pulse generator circuit, a bipolar amplifier dual transistor output circuit, and two sets of light indicator circuits. Install it in the flasher box, and through its control, it can accurately indicate the direction of car travel, especially with the feature of automatic protection. In the event of a short circuit fault in the circuit, it can automatically stop the flasher and light bulb operation. The driver can visually see the working status of the flasher through the fault indicator installed on the flasher, and can detect and troubleshoot faults at any time. There are three common types of flashers: capacitor type, wing type, and transistor type. A regular flash refers to a flash with an energy output that is not adjustable, meaning that the nominal flash index GN of the flash is a constant value. The circuit consists of four parts: oscillation boost part, rectification charging part, voltage indication part, and pulse triggered flash part. After the power is turned on, an intermittent oscillation is formed using the switching characteristics of transistor V1, causing the primary of T1 to obtain an alternating voltage. After T1 is boosted, the secondary of T1 obtains an alternating voltage greater than 300V. The alternating voltage is converted into a direct current voltage after half wave rectification by diode D1, which charges and stores energy for the main capacitor C2 and trigger capacitor C3. When the voltage is charged to about 70% of the rated voltage, the neon light (Ne) in the indicating circuit lights up, indicating that the flashing light is in a normal flashing waiting state. When the button AN is pressed, the triggering circuit (composed of R3, C3, T2, and Xe) generates a pulse voltage, which induces an instantaneous high voltage (about 10kV) pulse at the secondary end of T2. The nitrogen gas inside the Xe flash tube is ionized and connected through the trigger electrode of the Xe flash tube, and the electrical energy stored on the capacitor C2 is instantly converted into light energy through the discharge of the flash tube, completing a flash. The working principle of the built-in flash in the camera is the same as above. When the brightness of the external scenery is insufficient, the camera's metering system emits a low light message. At this time, the flash circuit is manually or automatically connected by the camera for charging and flashing. Some cameras also have a system that automatically controls the amount of flash (automatic dimming flash) to obtain more accurate exposure